This course serves as an introduction to modern web application development with JavaScript. The main focus is on building single page applications with ReactJS that use REST APIs built with Node.js. The course also contains a section on GraphQL, a modern alternative to REST APIs. The course covers testing, configuration and environment management, and the use of MongoDB for storing the application’s data. This year's edition of the course contains a new part on TypeScript. Content for this part is provided by Terveystalo This course is organised in 10 parts.

0. Fundamentals of Web Apps
1. Introduction to React
2. Communicating with server
3. Programming a server with NodeJS and Express
4. Testing Express servers, user administration
5. Testing React apps
6. State management with Redux
7. React router, custom hooks, styling app with CSS and webpack
8. GraphQL
9. Typescript
10. React Native

Parts 0-8 of the course material is written by Matti Luukkainen. The content of part 9 is written by developers from Terveystalo. Part 10 is written by Kalle Ilves. Numerous people have improved and corrected the material both in content and spelling. You can also make improvements to the course material yourself. The course webpage is designed and created by Houston inc, who have also audited the content of the course material. Chinese translation by Zhang Wei. The course material is licensed under Creative Commons BY-NC-SA 3.0 license, which means that you are free to use and distribute the material, as long as the names of the original authors are not removed. If you make changes to the material and want to distribute the modified version, it must be licensed under the same license. Using the material for commercial purposes is forbidden without permission.